当进程退出时，系统释放所有资源，利用这一过程。
When process exits, OS releases all resources, used by this process.
当进程退出时，系统释放所有资源，利用这一过程。更精确，资源可能被释放，不是因为GC工作。
When process exits, OS releases all resources, used by this process. So, to be more accurate, resources may be released not because of GC work.
在该方法中，我们的实现将调用MessageSender的cleanup方法，后者关闭并释放它占用的所有JMS资源。
In this method, our implementation calls to the cleanup method of MessageSender, which closes and releases all JMS resources it occupied.
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